公开(公告)号：US20170092887A1

公开(公告)日：2017-03-30

申请号：US15195024

申请日：2016-06-28

Applicant: LG Display Co., Ltd.

Inventor： JaeMan LEE ,  Taesun YOO ,  Mi-Young HAN ,  SoYeon AHN ,  Heedong CHOI ,  JungSoo PARK ,  Yoondeok HAN

IPC: H01L51/50 ,  H01L51/52 ,  H01L27/32

CPC classification number: H01L51/5004 ,  H01L27/3209 ,  H01L27/3211 ,  H01L51/5056 ,  H01L51/5072 ,  H01L51/5088 ,  H01L51/5271 ,  H01L51/5278 ,  H01L2251/552

Abstract: An organic light emitting device including an organic light emitting element having a low driving voltage and a high luminous efficiency is provided. The organic light emitting device includes two or more stack emission units, and a charge generating layer including an N-type charge generating layer and a P-type charge generating layer is disposed between the stack emission units. Herein, the P-type charge generating layer is formed of a material having an LUMO energy level similar to an HOMO energy level of a hole transporting layer injected with holes from the P-type charge generating layer. Accordingly, even if the P-type charge generating layer is not additionally doped with a P-type dopant, it is possible to readily inject holes into a stack emission unit adjacent to the P-type charge generating layer.

公开(公告)号：US20170155071A1

公开(公告)日：2017-06-01

申请号：US15192487

申请日：2016-06-24

Applicant: LG DISPLAY CO., LTD.

Inventor： Yoondeok HAN ,  JaeMan LEE ,  SoYeon AHN ,  Heedong CHOI ,  JungSoo PARK

IPC: H01L51/50 ,  H01L27/32

CPC classification number: H01L51/5004 ,  H01L27/3209 ,  H01L27/322 ,  H01L27/3246 ,  H01L27/3248 ,  H01L51/5016 ,  H01L51/504 ,  H01L51/5044 ,  H01L51/5056 ,  H01L51/506 ,  H01L51/5072 ,  H01L51/5088 ,  H01L51/5278 ,  H01L2251/552 ,  H01L2251/558

Abstract: Discussed is an organic light emitting display device. The organic light emitting display device can include a first emission part, a second emission part on the first emission part, and a first P-type charge generation layer between the first emission part and the second emission part. The first emission part includes a first hole transport layer, a first emission layer, and a first electron transport layer. The second emission part includes a second hole transport layer, a second emission layer, and a second electron transport layer. The second hole transport layer and the first P-type charge generation layer are disposed adjacent to each other. The second hole transport layer includes a first material and a second material. The first material has an absolute value of a HOMO energy level which can be greater than an absolute value of a LUMO energy level of the first P-type charge generation layer.

公开(公告)号：US20170155070A1

公开(公告)日：2017-06-01

申请号：US15163462

申请日：2016-05-24

Applicant: LG DISPLAY CO., LTD.

Inventor： Yoondeok HAN ,  Hongseok CHOI ,  SoYeon AHN ,  JungSoo PARK ,  Yosub LEE

IPC: H01L51/50 ,  H01L51/52 ,  H01L27/32

CPC classification number: H01L51/504 ,  H01L27/124 ,  H01L27/1248 ,  H01L27/3209 ,  H01L27/3246 ,  H01L27/3248 ,  H01L27/3258 ,  H01L27/3262 ,  H01L27/3276 ,  H01L51/5004 ,  H01L51/5056 ,  H01L51/5072 ,  H01L51/5278 ,  H01L2251/5384 ,  H01L2251/552

Abstract: An organic light emitting display device includes: a first light emitting unit including a first light emitting layer; and a second light emitting unit on the first light emitting unit including a second light emitting layer. The first light emitting layer includes at least one dopant and at least two hosts. The at least two hosts are different from each other in electron mobility and hole mobility.